Improvement in hydraulic presses



(5.- E. RYMES.

HYDRAULIC PRESS.

No. 38,606. Patented May -19, 1863.

Witnesses z r W v UNITED STATES PATENT OFFICE.

CHRISTOPHER E. RYMES, OF GHARLESTOVVN, MASSACHUSETTS.

IMPROVEMENT lN HYDRAULIC PRESSES.

Specification forming part of Letters Patent No. 38,606, dated May 19,1863.

To all whom, it may concern:

Be it known that I, UnmsrorHE'RE. Exams, a resident of Uharlestown, inthe county of Middlesex and State of Massachusetts, have invented a newand useful Improvement in the Hydraulic Press, and I do hereby declarethe same to be fully described in the following specification, andregiesented in the accompanying drawing, which is a sectional elevationof a press provided with my inven tion or improvement.

The nature of the said invention consists in the ai'rangreiwt orcombination of a screw and nut with the press-cylinder, piston, andplaten, substantially in the manner and so as to operate therewith, ashereinafter specified.

in the said drawing-s, A denotes the platen, l) the bed'plate, U and 1)the cross bars, and l) 1'] the upright posts or connection-bars of thepress. y

Cast or founded in one piece with the lower cross-bar, 1), isthehydrauliccylinder-F, within which the piston G, extended downwardfrom the platen A, is inserted, and, when in use, slides in astuiiing"inserted within a groove, (1 a, formed in the cylinder. ()nthat part of the piston which is between the stuffing; and the upper endof the piston when the said piston is at its lowest position in thecylinder, a male screw, I), isiormed or made. On I this screw a nut, 0,provided with one or more handles, 41 o, is screwed, the whole being asshown in the drawing. The object of such screw and nuj is to retain thepiston at any desirable position to whichit may be elevated by thepressure of water that. may be pumped or forced into the cylinder. \Vithpowerful hydraulic pressure itis diliicult to prevent more or lessleakage of the water from the cylinder, which, whenever it may occur,will diminish the amount of upward pressure of the piston. By theapplication of the screw and nut directly to the piston and cylinder,and the arrangement of the said screw and nut between the cylinder andthe platen in manner as above mentioned and as represented in theaccompanying drawing, we have the means of maintaining the pressure,irrespective of leakage, as described, asafter the elevation of thepiston we have only to so turn the nut on the screw as to cause the nutto descend closely upon the heador upper end of the cylinder, in whichcase the nut will support the screw at its attained elevation, and willmaintain it there, whatever may be the extent of leakage from thecylinder. By having the screw and nut applied directly to the cylinderand piston we avoid the necessity of employing any retaining appliancesin direct connection with either the upright rods or the cross-burs ofthe press; and, furthermore, we have the power-retaining mechanism sosituated that it will always operate centrally underneath and withrespect to the platen, and with a single rotary motion.

I claim The arrangement or combination of the screwb and nut c with thehydraulic-press cylinder F, 'piston Gr, and platen A, substan tially inthe manner and so as to operate therewith, as hereinbefore specified.

CHRISTOPHER E. RYMES.

Witnesses:

R. H. EDDY, F. P- HALE, J1.

